Study of mechanism of mixed conduction due to electrons and oxygen ions in (La $_{0.75}$ Sr $_{0.25}$ )MnO $_{3.00}$ and (Ba $_{0.5}$ Sr $_{0.5}$ )(Co $_{0.8}$ Fe $_{0.2}$ )O $_{2.33}$ through rietveld refinement and MEM analysis

Ito, Takanori*; Shirasaki, Saori*; Fujie, Yoshinori*; Kitamura, Naoto*; Idemoto, Yasushi*; Osaka, Keiichi*; Hirosawa, Ichiro*; Igawa, Naoki

We analyzed the mechanism of mixed conduction due to electrons and oxygen ions in (La $_{0.75}$ Sr $_{0.25}$ )MnO $_{3.00}$ and (Ba $_{0.5}$ Sr $_{0.5}$ )(Co $_{0.8}$ Fe $_{0.2}$ )O $_{2.33}$ through the Rietveld refinement and maximum entropy method analyses of neutron and synchrotron X-ray diffractions. It was found that Mn-O plane in (La $_{0.75}$ Sr $_{0.25}$ )MnO $_{3.00}$ has a strong, isotropic covalent bond that enables conduction of electrons. The (Co, Fe)-O2 plane with a covalent bond and a low concentration of oxygen vacancies in (Ba $_{0.5}$ Sr $_{0.5}$ )(Co $_{0.8}$ Fe $_{0.2}$ )O $_{2.33}$ can also conduct electrons. On the other hand, the (Ba, Sr)-O1 plane in (Ba $_{0.5}$ Sr $_{0.5}$ )(Co $_{0.8}$ Fe $_{0.2}$ )O $_{2.33}$ , which has a high concentration of oxygen vacancies, large isotropic displacement parameter, and a strong ionic bond, is responsible for the diffusion of oxygen ions.

Language	:	English
Journal	:	Denki Kagaku Oyobi Kogyo Butsuri Kagaku
Volume	:	77
Number	:	2
Pages	:	p.161 - 168
Publication Year/Month	:	2009/02
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Paper URL	:	https://doi.org/10.5796/electrochemistry.77.161
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Keywords	:	no keyword
Research Facility	:	JRR-3M(研究炉3)
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Registration No. : AA20080990
JAEA Abstracts No. : 37000766
Paper Submission No. : 5805

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Study of mechanism of mixed conduction due to electrons and oxygen ions in (LaSr)MnO and (BaSr)(CoFe)O through rietveld refinement and MEM analysis

Study of mechanism of mixed conduction due to electrons and oxygen ions in (La $_{0.75}$ Sr $_{0.25}$ )MnO $_{3.00}$ and (Ba $_{0.5}$ Sr $_{0.5}$ )(Co $_{0.8}$ Fe $_{0.2}$ )O $_{2.33}$ through rietveld refinement and MEM analysis